Crime is one of the major problems encountered in any society. Thus, there is an important need for security agents and agencies to battle and eradicate crime. Sri Lankan police is responsible for investigating and detecting criminals of any crime committed within the country. Crime is an act usually deemed socially harmful, specifically defined, prohibited and punishable under criminal law. Crime rates are rapidly increasing and changing. Crime prediction is very important in any country. In Sri Lanka, crime detection among people is very crucial to Department of police office. The purpose of Identity investigation system with suspect prediction that tracks the investigation status of criminal cases with logs and also predicts primary suspects. This project is mainly based on Android Studio and WEKA tool. This project has main two parts. In system has suspect prediction part. In this system it uses data mining techniques for prediction process. For that purpose, mainly system uses WEKA Tool. Identity investigation process is second main part of this project. It is doing by using SQL functions. It uses Short Message Service (SMS) and other functions for data security. Basically, mobile application development doing by Android Studio.